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Development and validation of a 3D-printed interfacial stress sensor for prosthetic applications Development and validation of a 3D-printed interfacial stress sensor for prosthetic applications Development and validation of a 3D-printed interfacial stress sensor for prosthetic applications A novel capacitance-based sensor designed for monitoring mechanical stresses at the stump–socket interface of lower-limb amputees is described. It provides practical means of measuring pressure and shear stresses simultaneously. In particular, it comprises of a flexible frame (20 mm × 20 mm), with thickness of 4 mm. By employing rapid prototyping technology in its fabrication, it offers a low-cost and versatile solution, with capability of adopting bespoke shapes of lower-limb residua. The sensor was first analysed using finite element analysis (FEA) and then evaluated using lab-based electromechanical tests. The results validate that the sensor is capable of monitoring both pressure and shear at stresses up to 350 kPa and 80 kPa, respectively. A post-signal processing model is developed to induce pressure and shear stresses, respectively. The effective separation of pressure and shear signals can be potentially advantageous for sensor calibration in clinical applications. The sensor also demonstrates high linearity (approx. 5–8%) and high pressure (approx. 1.3 kPa) and shear (approx. 0.6 kPa) stress resolution performance. Accordingly, the sensor offers the potential for exploitation as an assistive tool to both evaluate prosthetic socket fitting in clinical settings and alert amputees in home settings of excessive loading at the stump–socket interface, effectively preventing stump tissue breakdown at an early stage. interfacial sensors, stump–socket interface, lower-limb amputees, stump ulcers 10.1016/j.medengphy.2014.10.002 1350-4533 132-137 Laszczak, Piotr da02733e-0d18-4d14-bc54-af80ee97d2fb Jiang, Liudi 374f2414-51f0-418f-a316-e7db0d6dc4d1 Bader, Dan L. 9884d4f6-2607-4d48-bf0c-62bdcc0d1dbf Moser, David 09874cab-348f-47f9-b018-1c2875d16998 Zahedi, S. 5b9f308c-b703-4a7a-a85a-03311c3419a1 January 2015 Laszczak, Piotr da02733e-0d18-4d14-bc54-af80ee97d2fb Jiang, Liudi 374f2414-51f0-418f-a316-e7db0d6dc4d1 Bader, Dan L. 9884d4f6-2607-4d48-bf0c-62bdcc0d1dbf Moser, David 09874cab-348f-47f9-b018-1c2875d16998 Zahedi, S. 5b9f308c-b703-4a7a-a85a-03311c3419a1 Laszczak, Piotr, Jiang, Liudi, Bader, Dan L., Moser, David and Zahedi, S. (2015) Development and validation of a 3D-printed interfacial stress sensor for prosthetic applications. Medical Engineering & Physics, 37 (1), 132-137. (doi:10.1016/j.medengphy.2014.10.002). Record type: Article Abstract A novel capacitance-based sensor designed for monitoring mechanical stresses at the stump–socket interface of lower-limb amputees is described. It provides practical means of measuring pressure and shear stresses simultaneously. In particular, it comprises of a flexible frame (20 mm × 20 mm), with thickness of 4 mm. By employing rapid prototyping technology in its fabrication, it offers a low-cost and versatile solution, with capability of adopting bespoke shapes of lower-limb residua. The sensor was first analysed using finite element analysis (FEA) and then evaluated using lab-based electromechanical tests. The results validate that the sensor is capable of monitoring both pressure and shear at stresses up to 350 kPa and 80 kPa, respectively. A post-signal processing model is developed to induce pressure and shear stresses, respectively. The effective separation of pressure and shear signals can be potentially advantageous for sensor calibration in clinical applications. The sensor also demonstrates high linearity (approx. 5–8%) and high pressure (approx. 1.3 kPa) and shear (approx. 0.6 kPa) stress resolution performance. Accordingly, the sensor offers the potential for exploitation as an assistive tool to both evaluate prosthetic socket fitting in clinical settings and alert amputees in home settings of excessive loading at the stump–socket interface, effectively preventing stump tissue breakdown at an early stage. This record has no associated files available for download. More information Accepted/In Press date: 1 October 2014 e-pub ahead of print date: 23 October 2014 Published date: January 2015 Related URLs: https://doi.org/10.5258/SOTON/D0480 Keywords: interfacial sensors, stump–socket interface, lower-limb amputees, stump ulcers Organisations: Engineering Science Unit Learn more about Institute for Life Sciences research Identifiers Local EPrints ID: 373344 URI: http://eprints.soton.ac.uk/id/eprint/373344 DOI: doi:10.1016/j.medengphy.2014.10.002 ISSN: 1350-4533 PURE UUID: 3ce69d65-5e8c-477c-94d8-54548d0e8b3e ORCID for Liudi Jiang: orcid.org/0000-0002-3400-825X ORCID for Dan L. Bader: orcid.org/0000-0002-1208-3507 Catalogue record Date deposited: 15 Jan 2015 16:36 Last modified: 09 Jan 2022 03:36 Export record ASCII CitationAtomBibTeXData Cite XMLDublin CoreDublin CoreEP3 XMLEndNoteHTML CitationHTML CitationHTML ListJSONMETSMODSMPEG-21 DIDLOpenURL ContextObjectOpenURL ContextObject in SpanRDF+N-TriplesRDF+N3RDF+XMLRIOXX2 XMLReferReference ManagerSimple Metadata Altmetrics Share this record Share this on FacebookShare this on Twitter Share this on Weibo Contributors Author: Piotr Laszczak Author: Liudi Jiang Author: Dan L. Bader Author: David Moser Author: S. Zahedi Download statistics Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website. 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